Even though the light is not an input in the Calvin-Benson cycle, CAM plants fix CO2 in the night time by PEP Carboxylase and wait until daytime to perform the Calvin-Benson cycle becauselight is needed to warm up the plants to perform Calvin-Benson Cycleit needs ATP and NADPH from the light reactions.the O2 from light reactions is used for respiration which releases CO2 for Calvin-Benson cycleOxygen from light reactions is needed for Calvin cyclelight splits water to extract hydrogen

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